31.

The plot of a concentration of the reactant versus time for a reaction is a straight line with a negative slope. The reaction follows a

• first order rate equation

• zero order rate equation

• second order reaction

• third order rate equation

When calomel is treated with ammonium hydroxide, a black substance is formed. The black substance is

• Hg + HgO

• HgO.HgCl₂

• H₂N-Hg-Cl+Hg

• Hg(NH₂)₂ + HgO

Which of the following metal ion forms unstable complex with CN^-?

• Ag(I)

• Zn(II)

• Cu(II)

• Cr(II)

In a solid, a tom M occupies ccp lattice and 1/3^rd of tetrahedral voids are occupied by atom N. Find the formula of solid formed by M and N.

• M₃N₂

• M₂N₃

• M₄N₃

• M₃N₄

Hair cream is

• gel

• emulsion

• solid sol

• sol

Electrode potential of hydrogen electrode is 18 mV, then [H⁺] is

• 0.2

• 1

• 2

• 5

According to Hardy schulze law, the flocculating power of an ion increases with

• decreases in size

• increase in size

• decrease in charge

• increase in charge

Energy of activation of forward reaction for an endothermic process is 50 kJ. If enthalpy change for forward reaction is 20 kJ then enthalpy change for backward reaction will be

• 30 kJ

• 20 kJ

• 70 kJ

• 50 kJ

What is the role of aniline or cresol when added in a froth floatation process?

• Stabilizer

• Depressant

• Wetting agent

• All of these

Assertion : EDTA forms complex with divalent metals of 3d-series in the ratio of 1:1.

Reason: EDTA has 4-COOH groups.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.